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Re the reformed accepting RC baptisms. What you said has been my understanding, but in the recent Presbycast episode “What hath Geneva to do with Rome?” ( https://www.youtube.com/live/z6UR6_12Z-s?si=6uSwnTvGN4Ui9ZD7 ) it was a much more open question, with folks I would expect to know, REs and TEs, saying no.
See these:
None of the magisterial Reformers were re-baptized. They were all baptized in the Roman communion. The Reformed orthodox affirmed the validity of Roman baptism.
The only P&R people I know who deny the validity of Roman baptism are some Southern Presbyterians but that’s not the mainstream P&R view tradition on this question. Vatican II doesn’t really change things much. Now Romanists can read the bible (which is an improvement) but there are universalist elements in Vatican II. The Mariology is worse since the 19th century but the reforms of some of the grosser abuses is an improvement.
It’s a wash as to whether Rome is more corrupt now than then. If corruption were the problem, the Reformers would have repudiated Roman baptisms but they didn’t. The appeal to corruption might arguably be a sort of Donatist argument anyway, which is problematic in itself.